Ratings & Reviews for Bar’s Leaks Bars Leaks Liquid Aluminum Radiator and Heater Core Cooling System Radiator Stop Leak 16.9 oz
Ratings may include incentivized customer reviews.
What Customers Are Saying
Customers overwhelmingly praise this leak sealant for effectively stopping radiator and heater core leaks within minutes or after a short drive. Most report dramatic results like "leak completely stopped" and "sealed up my radiator quick," calling it a life saver. Reviewers consistently highlight its affordability and ease of use—simply pour and drive without tools or professional help—often saving hundreds on repair costs. Many report sustained success over weeks or months, with some using it repeatedly over years for older vehicles. A few note it works only for minor leaks, not major damage, but overall customers strongly recommend it as a reliable temporary solution.
Customer review summary generated by AI, including incentivized reviews.Excellent product
Would Recommend[This review was collected as part of a promotion.] This is a good product for stopping leaks and I highly recommend it
From Rislone
Great product
Would RecommendNo leaks four months after use and still going. Wasn’t expensive and was easy to find my local Napa
From Rislone
Works great
Would Recommend[This review was collected as part of a promotion.] I bought this and sealed my radiador almost instant
From Rislone
Bars leak radiator leak seal
Would RecommendI had a leak in my radiator and a friend recommended me to use this product which I'm glad I did I saved my self from buying a new radiator and also a repair labor cost it worked and it stoped my leak
From Rislone
Held long time
Would RecommendUsed it once and the car lasted another 3 years before I had to just replace the whole car
From Rislone
Did the job
Would RecommendGot this as a last resort, and to my surprise it worked. Several months have gone by now and it's still holding strong.
From Rislone
Good for wranglers
Would RecommendBought it this week for my jeep wrangler can wait to use
From Rislone
It works
Honestly, this stuff is a lifesaver. I noticed a slow coolant leak and was dreading a huge mechanic bill. I poured this in, drove around for a bit, and the leak completely stopped. It's been holding strong for weeks now and saved me hundreds. Definitely keep a bottle of this on hand.
From Rislone
This product did exactly what I bought it for.
Would Recommend[This review was collected as part of a promotion.] I bought this product 3months ago and have no problems since then. It is a grear product.
From Rislone
It did it job great product
Would Recommend[This review was collected as part of a promotion.] I used it as of two weeks ago doing it’s job so far
From Rislone
Bar’s always comes to the rescue
Would Recommend[This review was collected as part of a promotion.] We have a number of vintage cars and at the first sight of unidentified problem spots, we will use Bar’s to further the enjoyment of the vehicle. If Bar’s can’t fix it, it is something that really needs work - and we are ok with that. One day, I will follow the advice from a former mechanic - he said to put all types of Bar’s in when you get a used car.
From Rislone
Good stuff
Would RecommendI have used this and it fixed the small leak I had in my radiator. Will use again. Came highly recommended from my dad
From Rislone
Fixed my forklift!
Would Recommend[This review was collected as part of a promotion.] I bought this a week ago because my forklift was leaking water and it helped me get back to making money!
From Rislone
Great Product
Would Recommend[This review was collected as part of a promotion.] Does the Job ! Great price ! A Product You Can Depend On !
From Rislone
Awesome
Would RecommendI purchased it about two weeks ago and it is working perfectly.. 💪
From Rislone
Best Product For Radiators
This product worked wonders on my radiator !! Definitely a recommend for anyone!
From Rislone
Great product
Would RecommendThis product works great affordable price and it does its job I will recommend it
From Rislone
Exceptional leak stop performance
Would Recommend[This review was collected as part of a promotion.] I used this in the heat exchanger system of the generator on my boat and it solved the leak issue coolant loss to allow continuous running without having to add additional coolant
From Rislone
Works great!
Would Recommend[This review was collected as part of a promotion.] Works great my radiator had a small leak and it stopped it
From Rislone
Recommend to try this
Would RecommendWhile usually not a permanent fix, this slowed down and eventually stopped a pinhole leak in an older vehicle. I have also used many other Bars Leak products and recommended them to customers when I worked at a parts store.
From Rislone